Runesmithing Adept

Prerequisite: Artisan of the Runesmith's Guild (if using the guild system)

You have excelled in your study of runesmithing and are regarded as a prodigy by your peers, gaining the following benefits:
• Increase your Dexterity or Intelligence score by 1, to a maximum of 20.
• Your proficiency bonus is doubled for any ability check you make with runesmith's tools.
• Over the course of a short rest, you can attempt to remove a runestone affixed to a piece of equipment without destroying it. At the end of the short rest, make a check with your runesmith's tools, where the DC is equal to the DC to create the runestone. On a success, the runestone is recovered.

RUNESMITHING INFORMATION

Crafting and Applying

Once all requirements are met, the process of creating a runestone is performed over a period of two hours, which can be split into shorter sessions such as during a short rest. At the end of the period, make a craft check using your runesmith's tools. When you make this check, you don't benefit from any bonuses (such as Bardic Inspiration) except your own ability score and proficiency bonus, unless you benefitted from the bonus for the duration of the craft.

Runesmith's tools modifier = your proficiency bonus + your Dexterity or Intelligence modifier (your choice)

The following rules also apply to the use of runestones:

• In order to use a runestone, it must first be affixed to a piece of equipment with the runic tag. Only equipment with the runic tag can channel the magical properties of runestones.
• A creature must be attuned to the item to gain the benefits of an affixed rune.
• A maximum of one runestone can be affixed to a piece of equipment at a time.
• A runestone can be removed from a piece of equipment, but it is destroyed in the process, unless one has the Runesmithing Adept Feat.
• For magical effects created by runestones, your spell attack modifier and spell save DC use the ability modifier of the weapon used for the attack.

Only a Runesmith can perform the delicate magical processes needed to apply the "Runic Tag"; wherein a socket of sorts is made, or a fitting for the gemmed runestone to be affixed upon. This can be performed on a weapon, suit or set of armor, or a shield and costs a value of 400gp that cannot be reduced in anyway as it's materials are unique and the components needed are expensive regardless of the market you may find them in. Other upgrades outside the "Runic Tag" have been created by DMheavyarms with upgrading of weapons and suits or sets of armor exist, but these will come as part of the Smithing Adept Feat. 

Ranks and their study time/cost.

1. Journeyman - 1 workweeks/10gp
2. Craftsman - 2 workweeks/20gp
3. Artisan - 4 workweeks/50gp
4. Master - 6 workweeks/100gp
5. Grandmaster - 10 workweeks/500gp

Additionally, each rank has it's own benefits when crafting runestones as long as at least one work day is devoted to Guild Work each week. 

The following benefits are immediately conferred to members on attaining a new rank. All rank benefits are cumulative. 

Journeyman. You have demonstrated the basic care and competencies expected of a runesmith. As a result of your studies, you gain a +1 bonus to checks you make to craft  runestones of common rarity. 

Craftsman. You are recognized as a full member of the guild You gain a +1 bonus to checks you make to craft runestones of uncommon rarity. Full members are able to perform guild work during downtime (see below). You can also earn at least 5gp per day of work in addition to a Modest Lifestyle for a weeks worth of work.

Artisan. You have demonstrated the capabilities of a  veteran of the guild. You gain a +1 bonus to checks you make to craft rare runestones. Guild artisans are eligible for the Runesmithing Adept feat (see next page). You can also earn at least 10gp per day of work in addition to a Comfortable Lifestyle for a weeks worth of work.

Master. Through diligent study, you have achieved the status of a master runesmith. You gain a +1 bonus to checks you make to craft very rare runestones. You can also earn at least 20gp per day of work in addition to a Wealthy Lifestyle for a weeks worth of work.

Grandmaster. You have ascended to the rank of grand master. You gain a +1 bonus to checks you make to craft legendary runestones. Grandsmasters are invited to attend meetings of the council, and often head local chapters. You can also earn at least 50gp per day of work in addition to an Aristocratic Lifestyle for a weeks worth of work.

Rarities of Runestones, Cost of Gemstone needed, and their Rank/DC needed to craft.

1. Common, At least 10gp - Journeyman Rank/10 DC
2. Uncommon, At least 50gp - Craftsman Rank/15 DC
3. Rare, At least 500gp - Artisan Rank/20 DC
4. Very Rare,  At least 1000gp - Master Rank/25 DC
5. Legendary,  At least 5,000gp - Legendary Rank/ 30 DC

From Heavy Arms' "The Armorer's Handbook".
Twitter: @DMheavyarms

I also copied over DMheavyarms'  Runestones into the Community as well. Simply search "Runestone -" into the Wondrous Magic Item Search. Add your own with that tag and lets build this up. Don't forget to show them love on Twitter, DMS Guild, and anywhere else they publish.

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